$$
      \Arrowvert,
      \arrowvert,
      \Downarrow,
      \downarrow,
      \hookleftarrow,
      \hookrightarrow,
      \Leftarrow,
      \leftarrow,
      \Leftrightarrow,
      \leftrightarrow,
      \Longleftarrow,
      \longleftarrow,
      \Longleftrightarrow,
      \longleftrightarrow,
      \Longrightarrow,
      \longrightarrow,
      \nearrow,
      \nwarrow,
      \overleftarrow x,
      \overleftrightarrow x,
      \overrightarrow x,
      \Rightarrow,
      \rightarrow,
      \searrow,
      \swarrow,
      \underleftarrow x,
      \underleftrightarrow x,
      \underrightarrow x,
      \Uparrow,
      \uparrow,
      \Updownarrow,
      \updownarrow
$$
